(define (smallest-divisor n)
    (find-divisor n 2))

(define (find-divisor n test-divisor)
    (cond ((> (square test-divisor) n) n)
        ((divides? test-divisor n) test-divisor)
        (else (find-divisor n (+ test-divisor 1)))))

(define (divides? a b)
    (= (remainder b a) 0))

(display "\n========================================\n")
(display (smallest-divisor 199))
(newline)
(display (smallest-divisor 1999))
(newline)
(display (smallest-divisor 19999))
(display "\n========================================\n")
